Commentaries:
Robertson's Word Pictures (NT)
When it is sown (otan sparh). Second aorist passive subjunctive of speirw. Alone in Mark and repeated in verse Mark 4:32.
Less than all the seeds (mikroteron pantwn twn spermatwn). Comparative adjective with the ablative case after it. Hyperbole, of course, but clearly meaning that from a very small seed a large plant grows, the gradual pervasive expansive power of the kingdom of God.
Other Robertson's Word Pictures (NT) entries containing Mark 4:31:
Luke 13:19
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